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rearrange data columns

Martin Ivanov 
Dear R users, 
 I need to to the the following. Let a= 1 2 3 
                                         4 5 6 
 and b= -1 -2 -3  be (2x3) matrices.
        -4 -5 -6 
 I need to combine the two matrices into a new (2x6) matrix like this: 
 
 ab = ( 1 -1 2 -2 3 -3 ) 
        4 -4 5 -5 6 -6 
 
 How can this be done in R? 
 


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Martin Ivanov rearrange data columns Oct 11 robin hankin rearrange data columns Oct 11 Peter Dalgaard rearrange data columns Oct 11 Douglas Bates rearrange data columns Oct 11 Henrique Dallazuanna rearrange data columns Oct 11 (Ted Harding) rearrange data columns Oct 11 Gabor Grothendieck rearrange data columns Oct 11